MEH-PPV与TiO2共混体系太阳电池性能分析

The performance of solar cell based on the blend of MEH-PPV:TiO_2

以MEH-PPV(poly(2-methoxy-5-(2′-ethylhexoxy)-1,4-phenylene vinylene)为电子给体材料(Donor,D),TiO2纳米线为电子受体材料(Acceptor,A),制成了共混体系太阳电池.从D/A材料共混体系的紫外可见吸收光谱(UV-vis)、光荧光谱(PL)、器件的电荷传输的光导J-V图等方面,分析了MEH-PPV:TiO2体系器件性能变化的原因.得出了当在纯MEH-PPV中掺入TiO2纳米线时,共混体系的太阳电池性能大幅度增加,当D/A比例为1:3时,其太阳电池在AM1.5光照下,其开路电压VOC为0.7V,短路电流密度JSC为0.3mA/cm2,填充因子FF为30.5%,能量转换效率η为0.091%.其能量转换效率比纯MEH-PPV作为活性层器件提高近60倍.发现当共混体系用苯硫酚溶剂回流时,其器件性能又提高了近一倍.

The solar cells based on the blend of MEH-PPV（poly（2-methoxy-5-（2＇-ethylhexoxy）- 1,4-phenylene vinylene） as donor and TiO_2 nanorods as acceptor were fabricated.We analyzed the cause of performance change of the device in detail by the ultraviolet-visible absorption spectroscopy（UV-vis）,photoluminescence spectroscopy（PL）,the current density-voltage（J-V） curve.When TiO_2 nanorods are dispersed in a polymer matrix,the performance of the device is greatly enhanced.The highest efficiency is achieved for the 1∶3（MEH-PPV：TiO_2 nanorods） weight ratio composition.We get an open circuit voltage of 0.7 V,short circuit current density of 0.41 mA/cm2 and fill factor of 31.8% under air-mass 1.5 solar simulator illumination,yielding a 0.091% power conversion efficiency（PCE）,which is a nearly 60 times enhancement over the PCE of the device based on the MEH-PPV as active layer.The device PCE is further increased twofold by refluxing in phenthiol.